HORIZON PROJECT

var deburrLetter = require('./_deburrLetter'),

    toString = require('./toString');

/** Used to match Latin Unicode letters (excluding mathematical operators). */

var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;

/** Used to compose unicode character classes. */

var rsComboMarksRange = '\\u0300-\\u036f',

    reComboHalfMarksRange = '\\ufe20-\\ufe2f',

    rsComboSymbolsRange = '\\u20d0-\\u20ff',

    rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange;

/** Used to compose unicode capture groups. */

var rsCombo = '[' + rsComboRange + ']';

/**

 * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and

 * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).

 */

var reComboMark = RegExp(rsCombo, 'g');

/**

 * Deburrs `string` by converting

 * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)

 * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)

 * letters to basic Latin letters and removing

 * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).

 *

 * @static

 * @memberOf _

 * @since 3.0.0

 * @category String

 * @param {string} [string=''] The string to deburr.

 * @returns {string} Returns the deburred string.

 * @example

 *

 * _.deburr('déjà vu');

 * // => 'deja vu'

 */

function deburr(string) {

  string = toString(string);

  return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');

}

module.exports = deburr;